Evening chaps. I ran out of my first tank of resin the other day. Bought a bag a resin today to refill it with. Any tips? So far i flushed out all but a few granuals of the previous lot, filled the tank about 2/3rds full and screwed the top back on. I would get 0 previously cos i live in a soft water area, but now even with the tap running really slowly its coming back 4 or 5. Any tips on what i could do differently, and whether 4 or 5 is ok on customers windows? cheers